Type-writing machine.



TYPE WRITING MACHINE.

APPLIoATlo FILED un. 1s, 1909.

Patented Jan. 3l, 19,11.

nieren.

LOUIS NEY, 0F HARTFORD, CONNECTICUT, ASSIGNOR UNDERWOOD TYPEWRITER COMPANY, 0F NEW YORK, N. Y., A ORPOBJYJJION- 0F NEW JERSEY.

TYPE-*WRITING MACHINE.

Specification of Letters Patent.

Patenten aan. si, ieri.

Application led April 16, 1909. Serial No. 490,369.

To all whom 'it may concern:

Be it known that LoUrs NEY, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Con neeticut, have invented certain new and useful Improvements in Type-Writing Machines, of which the folowing is a specitication.

This'invention relates to devices for releasably connecting the platen to the linespace wheel of a type-Writing machine, to permit the platen to be-rotated indepencL ently of the line-space wheel, when required.

The principal object of this invention is to provide, at a low cost, a simple device/of this character readily applicable `to existing machines, conveniently manipulated, and not liable to become deranged.

In the form of invention illustrated in the drawings, .the line-space wheel, which is loose upon the platen axle, is provided with a ring or drum. A inger-wheel is also yloosely mounted upon the platen axle.

Fixed to the platen axle between the drum and said linger-wheel is a cross-piece having one or more dos fulcrumed to it. vThe face of the finder-w eel is provided'with wedge or helicoidal' surfaces which, when the linger fili' wheel released from the platen.

'a view' similar to Fig. 2, but showing .the

wheel is revolved, act upon the dogs to force their outer extremities against the inner periphery of the ring or drum on the lineespace wheel, to bind the latter to thel cross-piece, and indirectly to the platen which is fixed .to the axle. At the same time said finger Wheel becomes locked against accidental re- `leasin movement. This arrangement forni an e cientand compact device, easily manipulable and not liable to become deranged.

In the accompanying drawings, Figure 1 is a view of the platen and platen frame of an Underwood front strike writing machine,

with' 'the present improvements applied thereto. Fig. 2 is a side view artly in section and partly in outside elevation of the improved device, showingV the line-space Fig. 3 is clutch actively connecting the line-space Wheel to the platen. Fig. Il is "a sectional view 'of the partsseen at Fi 2, with the line-space wheel removed, an` showing the cross-piece and dogs. Fig. 5 is a perspective View of the ingerWheel, part of the rim being broken away to show the helical Wedges of cam surfaces. Fig. 6 shows perspective lviews of several parts embodied in this invention.

The usual cylindrical platen 1 is fixed to an axle 2, whereby it is journaled in a platen frame 3, said axle 2 having at each end the usual hand-wheel l for rot-ating the platen.

Loose upon the platen axle 2, outside ofby means of springs 10. The levers 9 may be bent or knee-shaped to circumvent the axle 2; each lever being pivoted at one side of the platen axle and extending to the 'other side thereof, and the end ot each lever extending toward the pivot o f the other, thus making a compact structure.

A hollow linger-piece 11, loosely mounted on the platen axle 2, overlaps the drum 7 and forms a cap thereon. The usual knob 4, which is tixed to the projecting end of the platen axle, serves to confine the iingerwvhcel 11 against movement along the axle.

The iinger wheel l1 is Jrovided on its inner face with helical wedge or cam surfaces 12, which, when the wheel 11 is ref volved, act on the ends 13 of the levers 9,

to swing them in a direction along theplaten axis and turn the dogs 15 about their centers ll and cause said dogs to bite or wedge against the inner` periphery of the drum 7, A

thus wedging or binding the line-Space wheel 5 to the cross-piece 8 and indirectly to the platen l.

A stop 17 is provided on the eross-piece 8 to engage a stop 18 on the linger-wheel 11, to limit the releasing movement ci the latter; while to limit the locking movement of the same, the ends 13 of the arms 9 are arranged to abut against the jogs 19 formed on the wedge surfaces 12, shown at Fig. 5.

ico

The operator wishing to connect the linespace wheel 5 to the platen 1, holds the latter steady with one hand, while with the other hand he turns the finger wheel 11 toward him. This causes the cam surfaces 12 to travel along the'ends 13 of the arms 9, forcing the dogs 15 to bite the inner peripheryv 11-0 vturn or loosen the wheel 11.

cams l2. The dog arms may be made somewhat yielding to accommodate this movement. At this time it will be seen that pressure or reaction of the ends 13, being upon the flats 21, has no tendency whatever to On the contrary, the dogs cooperate with the hub` 20 of the hand wheel 4 to clamp the finger wheel 1]. against backward or releasing movement To release the line-space wheel from thel platen l, the operator holds the latter while he turns the hand wheel` 11 in the direction away from him. This relieves the pressure on the dogs 15, which, by reason of the springs 10, return to the released position, as shown at Fig. 2, thus disconnecting the line-space wheel 5 from the platen 1.

Having thus described my invention, I claim:

1. in a typewriting machine, the combination with a revoluble platen, of a line-space wheel loosely mounted, a friction ring or drum, a pivoted wedging dog to engage said drum, said dog having a power-multiplying arm which swings in a direction along the axis of the platen, a revoluble finger wheel, and a tace cam connected to said wheel to engage said arm toa force the dog to bite said drum and thereby bind the line-space wheel to the platen.

2. In a typewriting machine, the combination with a revoluble platen and an axle therefor, of a line-space wheel loosely mounted on the platen axle and having a friction ring or drum, a collar or cross-piece fixed on the platen axle and having a. pivoted dog to engage said drum, a lpowermultiplying arm for operating said dog, a

revoluble finger-wheel, and a cam operated by said wheel to engage said arm to force the dog to bind the drum and line-space wheel to the platen axle; said cam terminating in a dwell portion to be engaged by said arm at the completion of the vlocking movement of the finger wheel, to prevent unlocking movement of the latter.

3. ln a typewriting machine, the combination with a revoluble platen and an axle therefor, of a line-space wheel loosely mounted on the platen aXle and having 'a friction ring or drum, a collar or cross-piece fined on the platen axle and having a pivoted dog toA engage said drum, a powermultiplying arm for operating said dog, a revoluble finger-wheel, and a cam operated by said wheel to engage said arm to force the dog to bind the drum and line-space Wheel to the platen axle, and means being provided to prevent movement of the finger wheel along the platen a-Xle.

4. In a typewriting machine, the combination with a revoluble platen, of a line-space wheel loosely mounted, a friction ring or drum, a pair of dogs pivoted to engage said drum, each dog having a power-multiplying arm, and a revoluble finger wheelhaving self-binding cams to engage said arms t0 force the dogs to bite said drum and to simultaneously arrest the finger-wheel and bind the line-space wheel ,to the platen.

5. In a typewriting machine, the combination with a revoluble platen, of a loose linespace wheel, a revoluble nger wheel, a friction ring or drum'within said finger wheel, and a dog within said drum, to engage the interior thereof, said dog having a powermultiplying arm which swings in a direction along the axis of the platen, said finger wheel having an interior face-cam to engage said arm, to force the dog to bite said drum and thereby lock the line-space wheel to the platen. f

6. In a typewriting machine, the combination with a revoluble platen, of a loose linespace wheel, a revoluble finger wheel, a friction ringer drum within said finger wheel,

and a dog within said drum, to engage the interior thereof, said dog having a powermultiplying arm which swings in a direction along the axis of the platen, saidv linger wheel having an interior face-cam to engage said arm, to force the dog to bite said drumand thereby lock the line-space wheel to the platen; said face-cam terminating in a dwell portion to lock the dog in effective position.

7. In a typewriting machine, the combination with arevoluble platen, of a loose linespace wheel, a revoluble finger whe'el, a friction ring or drum within said linger wheel,

and pivoted dogs within said drum, to engage the interior thereof, said dogs having power-multiplying arms which swing in a direction along the axis of the platen, said finger wheel having interior face cams to engage said arms, to force the dogs to bite said drum and thereby lock the line-space wheel to the`platen.

8. In a typewriting machine, the combination with a revoluble platen, of a line-space wheel loosely mounted, a friction ring or drum, a pivoted wedging dog to engage said drum, said dog having a power-multiplying arm, a revoluble finger-wheel, means operated by said wheel and engaging said arm to arrest the finger-wheel and force the dog to wedge or bind the drum and line-space wheel vto the platen, and a spring tending to disengage the dog from the drum.

drum, aco

face-cam to engage axle and a line-space wheel, of a friction ring or drum, a collar or support, dogs pivoted upon said collar or support at one side of the platen axle and having arms extending to the other side of the platen axle, each arm extending toward the pivot of the other, and a finger Wheel having face cams to engage the ends of said arms to cause the dogs to Wheel and platen together.

. LOUIS NEY.

lVitnesses:

WV. M. BYORKMAN, LYMAN D. BROUGHTON.

bite the drum and look the line-space 

